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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3de0f3eb193fd3c576a1d17fc946a1a41a2a01ef4fdfed3c55973eb8bfcbbd' 
  AND token = 'VAW+dKSKfsgTNw58NJEktLkFu11AcFfAaKTD3Gf+WeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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