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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933080192762569984bdc0f33ec34bc00c07d0961dcf0eaf06691c92d74777ed' 
  AND token = '3wM/ukqJKU4Cv+y8Ciut8paJn5waZp2p7h55ktr2RLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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