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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b2a4769e8c5411ffbd5f16260ddee4814d4cbb05243a2f0f7f28cf18d036bc' 
  AND token = 'j8Y9X91sofKeWSV77/+CRhnsbG6aZkhD1pwd50R1kKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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