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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e4aa4f5e2c28ddbaabc213422c092aa1ff35ad4ef023a6b1d1150b73af50e0' 
  AND token = '8peM8YAiIVZ26TBONozkrU1fjmOybykVKvTUtguHxPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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