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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a6d8904bf9aa04254f3144e6de5ff7d58a434539332bb7dc39cd114c5a4bd6' 
  AND token = '6nWeht++tI+Sy0lD5nuH3FuzyjXtdXZx5Uva9MsdQwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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