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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9165d6ff89ce6da8857aea77d827e352ef1ae26e4c90a0922af7ce440995e3' 
  AND token = '3GKF6PtBjR/ccL2X4J55LCGbTjhu1+DczKTJy4yB58U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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