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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd45372bdd35708ffffea83c07c04ca69731422efb1f8377dd819fdbed83d2b9' 
  AND token = '73vjm5SSOBShI6SLM3NigC+gMKC+4QS32Djl/3Zet2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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