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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b9aaa69a94c9b32d587bdb93a4b8bc17405433739aa2abab9145abf230b10f' 
  AND token = 'lwgZY0OwA5SVJZSvXivhuHn2g9OWuWLmkTnChJbIx98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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