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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb48fdaf59cc737cb14e8283defc9d69a19778f635e6fa1ab5cb12bed056fef' 
  AND token = '5IAVfdDHEEPc/mD1PXNvvJpN+YeICIqHZSigYH2GCFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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