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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c4d189c4c9589fcad405289ce953d40fed509186d660120cbdcdcf54729c87' 
  AND token = 'MeqWaxU4v17m1J7Mm6K13KR6j6eojgcGe9eimutk8hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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