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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8f7b65492d58398c08132add5a20f24e0f774c48ae1e9e1ca8ec91f3be18a9' 
  AND token = '8/i5G36tE9rmMtFOVfQlOvTb/D0qb/+5oTikPbbjfdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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