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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e52abf5dbec0d75db39ebdc27732d28e0e87688b9e13f67c771d9059d29ae43' 
  AND token = '4Jn4mun8MFwQS2dVkzuolkcUX71pQstFbudoQ2PUfco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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