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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58908b798b2609055e48cac0aa4f28b4807a94994c5ed300ca651555f9995e7' 
  AND token = 'vfnnQPVscUcx7Xt9fmFR6KlPBafcOjAmxwmasm/pQhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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