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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20e3f3964296c4fe22e717cec3588a535fa342c486a10ae1b4d13272ab4f77f' 
  AND token = 'fag2Yv9DKmLgsClJkLflgcg3S7RhHJHk+a8F4AJL3+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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