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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946a974b45f6f8c314055d08ecdc297cf096d643b2e127670eb969c5cec5a0fd' 
  AND token = 'Cl6ko09oVnOXa0AotP/zm8Yc/kMpJnZwo9y5GOyiY0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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