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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74b5d3af7d655ae58529ad79e95cd4fd71f703d5552e7a2a1c000754818a47c' 
  AND token = 'qtmNn3l9VrgzU9GxE/5QaQ1dayRfSHX0Au53tqdkzrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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