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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0157aba556747a07b000e6e8789c15466f1bfd8d768f4656e2984e01174def60' 
  AND token = 'OfJr2O3kqMHOriJ83Zw0jSYIszhls0sxvmDVrZxpEjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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