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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30b2b9f97e8184f0f82e955fe86a24998d88e3b471748a59bfdc41c5c4f395a' 
  AND token = 'IOnECjwh8y1LUoC/aI77awlQ9p9MMkIe0u1RbohGJJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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