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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '858a74e30675baa9fffae277ade87127ce639464e4a42a2d97b9ec8761a312b1' 
  AND token = 'JQJ8sFhj8eFHXnhv2Buou+8y774E+FXkuQ5M95QWpek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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