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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d4f0961888a8a81e623281ff3d5c01bdc74f0667b05821d200a9b2fcd498c0' 
  AND token = 'zbuLo1tAZOos+16TIatairnILWh0kiHWrgcKQAHgz9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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