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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19d5c4c1fecf66d16d21dfcdc9a09280441b1fe0e1806ffe4debfaaaadd8d5d' 
  AND token = 'zUcz7lsq0rDU7mqUA+XUbnMcEXcxxlxF7SLeux5ABSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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