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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68e383f565da95baf200efb00aa79bcc34b19898a361918a700c90a8c8a1261' 
  AND token = 'dyOVR2LNk4Nok8f3vl/FT7mVelm7s7cv57k5CuyMsTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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