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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e393c147104d465b3da439899a0a6d82e6f68332ae2fe602105296235e496168' 
  AND token = '7eL5aYC/f92ejjwXBnCrzdQ8m9A6YjjtJsh0DbBwjQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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