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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804fd8e9227a24c197d03db412cfa41f107cab6a2c6a86aceea1925ec8d88b45' 
  AND token = 'a85/36dAmlydG3F1kmwAOfQUMTsf2hI8x4zfirJRRwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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