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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ff26151bb4ff93180a18793dac3ec0f746937ae03825405109af4314a9a613' 
  AND token = 'gsuW3xuT7mhrwviOONgmt071WSPQOTLVUb1GSUQX9u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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