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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea567d14a7f3f1ddea29bf67d435f4c51388c91e09a1aae28839b04bb9b12735' 
  AND token = 'RQNGZ9EYTfggrlkR1XeBIDMasA15yls0KPSP8obj990=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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