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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f84e3695e395401a398dd475355d297b3b04d6904858595755aafa4408301f' 
  AND token = 'wXF5voYGHMMlS+7oC5N0lqanUo6EZ7p+qrMnPdUo8nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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