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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7c5ae7c78dda709f9252694fca5f45f60f90b606b9f5b4732ef01e7522539e' 
  AND token = '30NUS86erg8yMLU2P+G1ZyQuG7Xb6WPWGjtR/1fmIrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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