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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c14b5643f6924276ed69414fd7ee8cf2f4694e369be65e6bbbbf295ba312896' 
  AND token = 'ttSlH9EArD0a0pP3l8Qf9JXBhht7GsLppdlJnOaLORw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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