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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3129e345bb188b4bee17789f11b42b0624a80fddb4a7b86ffb014583f2d831e2' 
  AND token = '4rfxonhZRvc1Pdnv148QrpjBqd2Z8f9w4i+hUHJxkV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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