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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea07876ee02efe9ba8dbcbba7e1930b0c3db82995df619c01d4bdf972e7b7ad' 
  AND token = 'NyjYQKHTa3e9twJqgsg9OsHc1Wg6oUOeaj8O/ofz0Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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