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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214ad4444dce661325ef7e3d178f9c6972975ca6aef3257c57f62aacc65fe550' 
  AND token = 'QYagTKWjUYCnz4n8YY+r2AeOtpdWScVc4NLoUeNX2Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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