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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25020a6a1659af9477f679e1d7fd1e810770713f5df526d0ddc549b6b04167f1' 
  AND token = 'azXGlOidqwgRzVNpLP8Dp6GQbXMkpM1WfD22diehjyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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