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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c6c71112d3592fcd18d64388afafbbf7853c75bc4baf8e0d368ba42fe7fa66' 
  AND token = '24VilJ28X3ODJnmDG/T5yXd+43dSjGgs5FI31kSW6AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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