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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b323dc4e0cc73fad1616445f1964f68b9cbb0d65b2f554de43f4334c64652df' 
  AND token = '8HuVoaePb9eiD0m2nsKEYbeAcSe2psBW4CutzyOmxl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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