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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237aa70e25f5b24a926638b3e45ca0d502c15462286bef681f19e8b77f252188' 
  AND token = '3/o9y4zk9ey9t0Ds81LOlvojcG/yc6zNPh2v2H5INZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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