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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d92a3f8717c774aa58d59b3b3ea3baddd8c188d3e47b4c76663164018a9788' 
  AND token = 'LsHIuBPYT4h8D31i5abpB52akatJXlhzD8qZMMfxvq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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