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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b41d5f22e4e96ca4b5a8cc0f5882f8e0863efa9931df5160ed1f331641504a' 
  AND token = 'cmXSRpzN+sdy7LNkJPs/3K3Iq6LYX3DeEN5PztZsL34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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