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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9391182acb4bbb60a0fc2b36487e70a17ed061e46493e3fa9e91fbf34c80a8ca' 
  AND token = '7R3RJbiXN2+PlwiEYN00o2pFQkwfxtsPcXgnHJ/Y9Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}