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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d89ef3f11793e98a1b7feeb6e4bed3af4e628f0e7eaf033b59f89fa70b331b' 
  AND token = 'sxjTl40OpKxFTkkwwm/304JyocwcjQMff5oQ4uI+n/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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