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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b343c0301b5cd9c61d972c292c1e6a6fcd7fa41fdc70402bc4e0bf6356a0867c' 
  AND token = 'uBq4ZXsD4z66HaSpK35HsDv/c7/fj6rdMucYMnvMbg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00130

JSON explain

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