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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5a21f726848c22067b96d717f5d4e1c37eed6df649f20e23c6b4f7bdb535be' 
  AND token = 'DyK2uZjjfi+WIQbyO3+Qtn8j6C+Ll/E80C+ljCYlF98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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