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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02167144c282a1b89e72e31be57f8755872541f03d3179addea6467067aac577' 
  AND token = '1MLgJaB4B0wUBVHQEL4M5N0mijbXyc3KHmOvxizp1GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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