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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4625037f3cc3f3725c528212b0a8e431acd1fac79c5636a2cf97aebf7732abe' 
  AND token = 'ZLAQ/SxuDrc2Ca0EE6o/28sh40IpYqteh+818BCpPEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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