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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e071967f70620cdfe73a5357f2306cc3e5002fc9e9631376feaa4deb80e19fd8' 
  AND token = 'AkTA0TalVZG7YOEJPRvHP2pRyP76/ehjX7ITM2qF21k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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