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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943aea6330e2330cfe1cf440e3a21d0234b1b42d359fb6734979eb224e661d83' 
  AND token = 'OFAoqG83OdCf5NjUwE3SQirX830FWTHD3PMznf5wrhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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