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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdb688539ba6027e8ea99b8d940dde3808a4d63c5b2c347e04efd34d2cef9af' 
  AND token = 'VvRFIpvkC4iVw2c3TktiG3YeHF8ijIL1s+l/UNja7+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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