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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9a9aed62ed08ef3922c3e9ce114e4427e7060d9669e10844f88883d08be4a8' 
  AND token = 'l7+7QqEF7sXb6GHyS07+rkDEk8n02RPMbyS32WaSyy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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