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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cada078aa90397b8744664a5032045339eda67671e62f84d44b811d4065b58' 
  AND token = '0Dk5ECX5xN3b5NJoCGve+IRv0aFc09QfQ5BakoskZ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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