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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce8c48477a49ada1ea3c0667d620cd0b28370253216c60d8737d458af15770a' 
  AND token = 'fcUEcDnsXmBLc9gwXiU7S4ePy+G0ohTyxeyoM4fJr4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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