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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e8c8025f25bc4edf83762ec9cc3ecf09dc841b21f48694bc84ca6ef8f7ffd6' 
  AND token = '12TAFiGbx//gywwajQ0QK8hsZNxmwZzujG30w1i0/+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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