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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9acbaf6c42aa0f63faf25aab0d035f71f6f292de1e05b8ebb51a821ae69a4768' 
  AND token = 'quwnag4s8CtfaaiqoZz5QV09zlDhUrEqRDsqbftK+EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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