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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '346fa418a158e183f927925ec71bee2ca15c34ce7baa4e0f939c44f2f26c7662' 
  AND token = 'NVpo9/jvakubxwvDizabkq/ZO2AP5CMqopWFpPhaiHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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