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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea83bfbf809896224dca6c196b0b20d75596997e90c1caf04269567f75faa01' 
  AND token = 'LykMw5MmGxGqUC6vyKYZeMsgcPTLg4Iu2fG/L75F0Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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