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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1071b853720c62efe1c71b3bf5473a14553e9113f70877170179f337f7d09476' 
  AND token = '/f95Ko/b0Zsza66HO9Tff2yzNmzxGWMKLVBbbdGmYPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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