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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65269b33321fa871db1d397e086bd02ec2588bb2c59571fe2c642d8a9ae1aafa' 
  AND token = 'eFHnSb1/Bxu/tJeHohbPD4IMLQYcNpUxRmXBXqJy/WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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