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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b2ad4c14f0eb279fcc7faaf9adcb6ed15ad3abfcec4b531228e0e26fdfd9de' 
  AND token = '7QMjoG5PR+9kZuxDSmZ1FYu1XFM9fjDqd5+lBmM8Kx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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