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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce541f5f4322d7ad8c05e78e7586839eb2a9c63072a745fe813ac11c8cb07f60' 
  AND token = 'R6VHNyENS7/z5B8ByLrfKlTm5cd5bokVjdjIWd2yaQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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