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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d02c3f4f8e0d184fdec3d6f0ed9de38797fdf79727ee3d73a0ae93e3875ee28' 
  AND token = '8W1EUBa4zujGbVIaSl86u1YvAbMoLO9AO1qWSz7UIOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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