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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e3766c8ff88d4ed782fbf65a899203caf89a8d63424531d1abae66e9f67e76' 
  AND token = '5spCbI9CufzPXlV+gGojrgfZkwJEDguO0SefmDKi0yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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