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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989b093e82f358a9f1e4edc0f6703ddd0794bf1377ce716d2082f420a1d62c50' 
  AND token = '5MmehFv3Emd8OEqJJYvpcok1bUFcGO8Jkf0+QBWEpYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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