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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b71316203a40e786739a427b3c55961f855b4f4bea287f7e3359bcb98657a5' 
  AND token = 'bdFnFdmURu0+rSDTb/la3fITOtr7Y5cRcYlwtHo2I0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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