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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd832651e1112d2c463f9fc0849ee16fb5c7d425d9ccca120b54a44a2215588' 
  AND token = 'SQtDw+1EIM3qAAngGx/wmaHUNp13qQxjeTdLckqqWQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00154

JSON explain

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